Protective covers for the Rectus 21 (or Series 21) connectors. Fit them over your existing couplings to prolong the life by protecting them from the rigours of day-to-day Window Cleaning. 

Each coupling has a universal male cover, with an optional 6mm or 8mm female coupling to match your hose size. 

Protect your Rectus 21 (or Series 21) couplings
Available to fit 6mm or 8mm hose
Snag-proof tapered design
Robust materials with a firm screw thread to fix together